The 500-Series double-barrel break-action shotguns are in the classic side-by-side configuration with barrels firing right to left with single resetting trigger. Barrels have interchangeable Rem MC-5 threaded choke tubes (SK, IC, M, IM, F). The 512 is chambered for 12 gauge with barrel lengths of 20” or 28”. The 520 is a 20 gauge with barrel lengths of 20” or 26”. The 28 gauge 528 comes with a 26” barrel. The 536 is a .410 bore with 26” barrel. Extractors are standard. Weights from 5.4 lbs. to 5.6 lbs. "T" models are Coach-style models.